MICROPOROUS TITANOSILICATE ETS-10 - A STRUCTURAL SURVEY

The structure of a microporous titanosilicate, ETS-10, has been solved using a combination of electron microscopy, X-ray and electron diffra ction, solid-state NMR and distance-least squares analysis. We describ e in detail how these tools have been applied to the structural soluti on. ETS-10 is a highly disordered, yet crystalline, wide-pore micropor ous framework material containing octahedrally coordinated titanium an d tetrahedrally coordinated silicon. The disordered material can be de scribed with respect to two ordered polymorphs: polymorph A, space gro up P4(1) or P4(3) with a = b = 14.8 Angstrom and alpha = beta = gamma = 90 degrees; polymorph B, space group C2/c with a = b = 21.00 Angstro m, c = 14.51 Angstrom and alpha = gamma = 90 degrees, beta = 111.12 de grees. Both polymorphs have a three-dimensional 12-ring pore system an d polymorph A has a spiral channel.